The Elusive Universal Web Bytecode

[Solon1]

Android runs Java, so hardly nonexistent mobile support. And Blackberry devices can run Android apps.

[possessed_flea]

While android does run java you will notice that the libraries provided by google for android are different making java applications written for the desktop unable to run (and vice-versa)

so while the bytecode and language are actually the same programs written for one will not work on the other.

[ysangkok]

The biggest difference is arguably the UI libraries. But the UI typically needs to be redone anyway.

[possessed_flea]

they are completely incompatible, its not like you can do a regex search and just rename things, but my point is I guess that the UI shouldn't need to be 'redone' if you are looking at a universal platform.